EP0934149B1 - Systeme de fermeture de moule, procede et systeme de moule pour produire des articles de grande dimension moules par injection avec application de pressions de fermeture tres elevees, ainsi que machine de moulage par injection ainsi equipee - Google Patents

Systeme de fermeture de moule, procede et systeme de moule pour produire des articles de grande dimension moules par injection avec application de pressions de fermeture tres elevees, ainsi que machine de moulage par injection ainsi equipee Download PDF

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Publication number
EP0934149B1
EP0934149B1 EP97909752A EP97909752A EP0934149B1 EP 0934149 B1 EP0934149 B1 EP 0934149B1 EP 97909752 A EP97909752 A EP 97909752A EP 97909752 A EP97909752 A EP 97909752A EP 0934149 B1 EP0934149 B1 EP 0934149B1
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EP
European Patent Office
Prior art keywords
mould
clamping
injection moulding
support block
sections
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97909752A
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German (de)
English (en)
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EP0934149A1 (fr
Inventor
Sytze Arnold Kuipers
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Foma BV
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Foma BV
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Publication date
Priority claimed from NL1004331A external-priority patent/NL1004331C2/nl
Priority claimed from NL1004509A external-priority patent/NL1004509C1/nl
Application filed by Foma BV filed Critical Foma BV
Publication of EP0934149A1 publication Critical patent/EP0934149A1/fr
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Publication of EP0934149B1 publication Critical patent/EP0934149B1/fr
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/02—Manhole shafts or other inspection chambers; Snow-filling openings; accessories
    • E03F5/021—Connection of sewer pipes to manhole shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/20—Opening, closing or clamping
    • B29C33/202—Clamping means operating on closed or nearly closed mould parts, the clamping means being independently movable of the opening or closing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/03—Injection moulding apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2673—Moulds with exchangeable mould parts, e.g. cassette moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/641—Clamping devices using means for straddling or interconnecting the mould halves, e.g. jaws, straps, latches
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F11/00—Cesspools
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/02—Manhole shafts or other inspection chambers; Snow-filling openings; accessories

Definitions

  • Mould closing system, method and mould system for producing large injection moulded articles with application of very high closing pressures as well as so equipped injection moulding machine.
  • the invention relates amongst others to a mould clamping device operating under extremely high clamping forces from 500 tons up and which is adapted for injection moulding of injection moulded products having relatively voluminous dimensions which are movable from the mould in several diverging directions.
  • the invention provides also for a new method, which application allows to make such products which are otherwise difficult to be moved because of their shape.
  • the invention provides for a bed plate, a mould support block and guiding means to be applicable in such a mould clamping device, as well as in a multipartite moulding system, more specifically e.g. for making so called manhole bottoms with connecting sleeves.
  • Injection moulding moulds for voluminous products, such as manhole bottoms are, however, very expensive.
  • An additional problem is that manhole bottoms have to be made in many different shapes. For each diameter and connecting angle of the piping connections to the manhole bottom, a specific manhole bottom has to be made with connecting sleeves having the correct diameter and the correct angle of intersection. This means that as many moulds are needed as there are alternative manhole bottoms required. Particularly those versions which are seldom used would become impossibly expensive.
  • the new mould clamping device according to the present invention however allows to remove all aforementioned disadvantages. According to this new method and applying the mould clamping device it becomes possible to manufacture self-removable products or products of large dimensions are movable in more different directions.
  • the great advantage is that now in a very well-thought way, the extremely high clamping forces required to be generated during the injection moulding process and the acting high clamping forces respectively can be achieved and absorbed.
  • the principle of the invention is based on the new application of commonly used controlling means and relatively low pressure means like those which are commonly used in the injection moulding method, in combination with an effective locking method for a number of separate mould sections. All this without the necessity to generate extremely high mould clamping forces for locking the mould and than keeping it locked during the injection moulding process and thereafter, using highly expensive hydraulicly and/or pneumaticly operated pressure-equipment as defined by the main-claim.
  • the invention provides a moulding system which allows the manufacturing of complex moulding parts while using a multipartite outer mould, which are self-removable, thereby applying a number of inner moulding parts in order to solve the problems of the different angle positions of the connecting sleeves and/or the positioning thereof in a manhole bottom or the like.
  • the invention provides amongst others for the manufacturing of any desired variety of manhole bottoms.
  • a mould clamping device 1 is shown with the main elements required for opening and closing respectively the mould.
  • a number of elongated [column-shaped] guiding means 2 and 2' is provided with a number of fixed rings 3 and 3' which are placed at a mutual distance L.
  • These rings 3 and 3' are each performed by two ring halves (Fig. 7) which are kept in a closed position by fixing means to form a ring.
  • Both extremities 5, 5' and 6, 6' of the guiding means 2, 2' are inserted into correspondingly formed guiding openings 7, 7' and into the relatively stiff bed plates 8 and 9.
  • the diameter of a guiding opening 7, 7' is calculated in such way that the bed plates 8 and 9 in their position according to Fig.
  • the surface of bed plates 8 and 9 is provided with a number of insert openings 10 of identical shape and dimension, which are distributed along the circumference of bed plates 8 and 9 according to a pattern which will be further explained.
  • Two mould support blocks 11 and 11' are shown which are provided each with an identical elongated portion at their upper and lower side respectively, consisting of a block shaped auxiliary means 12 and 12'.
  • the mould support block 11, 11' is at both sides provided at the lateral portions 13, 13' which are facing to the centre of mould clamping device 1, with additional surfaces 14, 14' which together form with the aforementioned lateral surfaces, the total clamping surface on which separate and, if required, differently shaped outer mould parts (not shown) can be clamped.
  • the block-shaped auxiliary means 12, 12' is, see Fig. 12, provided with a cylindrical concave undercutting 15, 15' which serves as a supporting surface for a cylindrical rotable wedge 16, 16' placed against it.
  • the insert opening 10, 10' in bed plates 8 and 9 is provided with a fixed counter wedge 17, 17' and the locking degree of the block-shaped auxiliary means 12, 12' is also determined by the self-adjustability of the position which can be occupied by the rotable wedge 16, 16' in the undercutting 15, 15'.
  • the mutual position of the mould blocks 11, 11' with respect to both bed plates 8 and 9 and with respect to the column-shaped guiding means 2, 2' is clearly shown in Fig. 2.
  • the clamping and locking respectively of the mould support blocks 11, 11' with those bed plates 8 and 9 can be achieved by means of cooperating wedges 16, 16' and 17, 17'.
  • the mutual position of the main elements of the mould clamping device takes place while using appropriate and known per se auxiliary equipment, such as lifting and transport apparatus and/or pressure cylinders and the like.
  • the parts of a guiding means 2, 2' which are projected beyond bed plates 8 and 9, are provided with a specially undercut profile 18 (see Fig. 7) for locking bed plates 8 and 9 on the guiding means 2, 2'.
  • clamping means 19, 19' which possesses a counter profile 20 which corresponds with profile 18.
  • the clamping means 19, 19' is in each case attached to a bed plate 8 and 9 respectively and surrounds a guiding opening 7, 7' which mainly consists of two clamping sliding halves 21, 21' which are operated by means of pressure cylinders 22, 22'.
  • a guiding opening 7, 7' which mainly consists of two clamping sliding halves 21, 21' which are operated by means of pressure cylinders 22, 22'.
  • FIG. 3 a mould clamping device according to Figs. 1 and 2 is schematically shown which is integrated now in an injection moulding machine 23, the main elements of mould clamping device 1 as described above being visible here.
  • the mould blocks 11 and 11' are assembled on L-shaped machine stands 24, 24' and both stands 24, 24' are movable along the separate machine guidings 25-30 which are positioned on the horizontally arranged machine frame 31.
  • Arrows III-III and I-I respectively indicate both directions of moving for exercising the clamping pressure for achieving the locking of mould support blocks 11, 11' by bed plates 8 and 9.
  • Fig. 1 a mould clamping device according to Figs. 1 and 2 is schematically shown which is integrated now in an injection moulding machine 23, the main elements of mould clamping device 1 as described above being visible here.
  • the mould blocks 11 and 11' are assembled on L-shaped machine stands 24, 24' and both stands 24, 24' are movable along the separate machine guidings 25-30 which are positioned on the horizontally arranged machine frame 31.
  • the mutual position of the machine guidings 25-30 in this embodiment is chosen in such a way that two of them, 25 and 28, are in line on an axis running parallel to the largest side of the rectangle, on the angular points of which intersect the axes of the four guiding openings 2, 2' and the plane of the horizontal machine frame.
  • This arrangement is such that during the closing respectively opening of the outer mould 32, 32', the mould support blocks 11, 11' with the mould sections attached thereto, can move freely from the outside to the inside and vice versa.
  • Fig. 7 the guiding means 2 is put through the upper bed plate 8 and the guiding means 2 is firstly provided with a conical part 35 of decreasing diameter, followed by a finishing part 36 which continues into the outer diameter of guiding means 2.
  • the clamping frame 37 is attached to bed plate 8 by means of clamping ring 38.
  • the clamping means 19 consists of two divided clamping slides 21 which together are integrated slidingly in a clamping frame 37.
  • the control, opening and closing, arrows O and S respectively of those clamping slides 21 takes place by means of two pressure cylinders 22.
  • clamping means 19 at the location of locking is further explained in Figs. 8 and 9.
  • pressure cylinder 22 has moved both clamping slides 21 away from each other in order to enable bed plate 8 (not shown), upon which the closed clamping ring 38 is attached by means of a number of bolts 39, to slide along side guiding means 2.
  • the counter profile 20 of clamping means 19 consists of the tapering clamping block 40 which is attached to the clamping frame parts 37 which are enabled to make a movement towards each other by operating both pressure cylinders 22.
  • Fig. 9 the locking position of clamping means 19 is shown with respect to the conically undercut section on guiding means 2. In the construction of the injection moulding machine described here, a total of eight clamping means 19 are applied.
  • Figs. 10 and 11 the mutual position of the different guiding openings 7 for the guiding means 2 and the insert openings 10 for the block-shaped auxiliary means 12 in bed plates 8 and 9 of Figs. 1 and 2 is shown.
  • Wedge surfaces 17 are also schematically indicated.
  • Fig. 12 shows in enlarged scale the position of the auxiliary means 12 towards bed plate 8.
  • the counter wedge 17 is attached by means of bolt 41 to a connector segment 42, which itself is attached to the upper side of bed plate 8.
  • Counter wedge 17 can be adjusted at height or depth by means of bolt 41.
  • the wedge angle is not larger than 8° in the embodiment shown here.
  • a cylindrical wedge is positioned which is protected for dropout by means of a bolt 43 which allows for some movement of wedge 16.
  • undercutting 15 allows cylindrical wedge 16 to move by adjusting the angle of wedge surface 16 only in cooperation with counter wedge 17 while being put in insert opening 10. This vertical locking thus achieved enables optimal lateral locking of all mould sections 32, 32' which are attached to mould support block 11. In the event of a correction being necessary to this locking, this could e.g. be achieved by adjusting the cooperating surfaces between wedges 16 and counter wedge 17.
  • bed plates Whilst in the embodiment bed plates are used, application thereof can be realized by means of a central hub with sections containing insert openings for guiding means, whereas its outer circumference may be shaped as a clamping ring.
  • This clamping ring can be provided with adapted wedge surfaces which cooperate with counterwedge surfaces at the mould support blocks.
  • a vertical injection moulding machine In a practical realization of an embodiment of a vertical injection moulding machine according to the invention, it has a vertical height of ⁇ 6 m, the height of the mould support block being 1,5 m and in an open position of the mould clamping device a height difference of 3 m exists between the inner surfaces of bed plates 8 and 9 which face each other.
  • the required space for the arrangement of the injection moulding machine see Fig. 5, with the machine stands 24 in open position, has an average diameter of 6 to 7 m till the outer edge circumference of the buffer blocks (terminations of the guiding rails, Fig. 1) for stands 24.
  • each massive bed plate having a diameter of ⁇ 3 m. has a thickness of 0,5 m.
  • a guiding means 2 may reach a total length of 5,5 m and a diameter of 0,3 m, with which tensile strain or deflection can be resisted.
  • the injection moulding machine in which the mould clamping device is integrated is e.g. able to operate with a total clamping force of e.g. 9,000 tons in all directions.
  • a total clamping force e.g. 9,000 tons in all directions.
  • the new method applied to a mould clamping device to be used in order to exercise extremely high clamping forces as described before thus consists of the following actions:
  • the mould system is in fact to be considered as a kind of open moulding fist in the inside of which the moulding product is realized.
  • a mould clamping device 101 horizontally arranged is basically identical to mould clamping device 1 of Fig. 1 and corresponding machine parts bare the similar references. Guiding means 102 are guided in bed plates 108 and 109, while the mutual locking of the bed plates takes here also place with clamping means 137 applying the same locking means 135 and 136.
  • the function of mould support blocks 11 in Fig. 1 has been taken over by quarter-cylindrical mould sections 111 which are locked by means of movement towards each other of bed plates 108 and 109 in cylindrical clamping blocs 109', which establishes the mechanical interlocking for the required force with the conical wedge surfaces 117 and 116 respectively.
  • Fig. 14 shows also an arrangement of a mould clamping device 101 according to Fig. 13 in a frame of an injection moulding machine, bed plates 108 and 109 being longitudinally to the machine movable on stands 124, 124', along a common guide rail 125.
  • the movements for opening and closing of the mould device can be achieved by pressure cylinders 134, which can establish each time a movement of each of the stands 124 with respect to the fixed central console 110.
  • a lifting device for placing the mould sections is integrated, which does not need further explanation and it does not belong to the invention.
  • Figs. 3-5 show schematically how mould support blocks are suspended to stands 24 and 24'.
  • a stand is each time provided with two suspension eyes which are positioned vertically above each other.
  • the mould support block 11, 11' itself is provided with a pin or axis which is guided through a suspension eye.
  • the mould support block retains thus a certain self-adjusting capacity if the clamping movement is initiated.
  • the suspension of the mould support block is also determined by several pins on the angular points, which can be appreciated in detail in Fig. 3.
  • the principle of the method applying a multipartite outer mould relies on a number of proceedings which are applicable even without using the mould clamping device.
  • the internal mould hole of the outer mould is initially provided with a number of separate core sections which, thus assembled altogether, constitute the required inner mould, whereby each of the separate outer mould sections of the multipartite outer mould are brought together in a direction pointing towards the inner part of the mould, mainly formed subsequently around the outer mould, in such way as to complete and close the outer mould.
  • this outer mould remains closed in this position by means of externally exercising of a temporary acting, relatively high clamping force and before the injection moulding starts as well as afterwards, this temporary acting clamping force turns into a constantly lasting extremely high clamping force, which is absolutely required during the injection moulding.
  • Maintenance thereof takes mainly place applying a relatively simple mechanical locking, particularly by some kind of direct or indirect mechanical locking of all outer mould sections in order to form the closed outer mould, which is achieved and permanently maintained during the subsequent cooling down process, without the need of extreme complex hydraulic clamping forces to be generated and maintained respectively for keeping the outer mould closed during injection moulding.
  • Fig. 17 three pipes 201, 202, 203 are guided through the cylindrical outer jacket 204 of a bottom section, whereby jacket 204 is provided with a number of flanges 205, 206 and radial enforcement ribs 207.
  • the three pipes 201-203 are interconnected centrally at the bottom section and constitute a Y-shaped connection 208.
  • Fig. 18 shows, in a cross sectional view according to the central axis of pipes 201-203, three outer mould sections 209, 210, 211 in closed position of the complete outer mould.
  • the upper and lower mould sections in axial position and the necessary core mould sections for the Y-shaped connection 208 for the moulding product according to Fig. 17 are not shown in detail.
  • Fig. 18 shows, in a cross sectional view according to the central axis of pipes 201-203, three outer mould sections 209, 210, 211 in closed position of the complete outer mould.
  • mould core 215 is used for the hollow pipe of the moulding product and further a part of a left mould section 216 and a right mould section 217 are visible, as well as a lower mould section 218.
  • Fig. 21 shows a number of manhole bottom-types A, B, C, D, E, F, which are manufactured each with a mould of the mould system according to the invention. All connecting sleeves of those manhole bottoms have the same diameter. However, it is possible to manufacture a manhole bottom with other mould elements of the mould system according tot the invention, applying connecting sleeves under different angles and/or with different diameters.
  • Manhole bottoms A, B, C, D, E, F are provided with flow profiles a, b, c, d, e, f by means of which the connecting sleeves within manhole bottoms A-F are connected together.
  • Surfaces a'-f' of flow profiles a-f are interconnected in such a way that each flow profile a-f forms a channel in the bottom of a manhole bottom. These surfaces a'-f' decline obliquely to flow profiles a-f.
  • the mould For manufacturing a manhole bottom use is made of a mould of the mould system according to the invention.
  • the mould comprises eight sections, one core part 301, a corresponding bottom section 302 and six lateral sections 303 (figs. 20, 23 and 27).
  • Each manhole bottom type requires a differently shaped core part 301 and a differently shaped bottom section 302 which corresponds to core part 301.
  • Lateral sections 303 consist each of a base section 304 and a removable exchangeable section 305 which is located in a notch 312 in base part 304.
  • Core part 301, bottom section 302 and the six lateral sections 303 together form in the closed position of the mould a mould hole 306 for a manhole bottom.
  • the 20 comprises a core 307 which determines the inner shape of a connecting sleeve of the manhole bottom.
  • Core 307 is connected with core section 301.
  • the bottom hole shaped by mould hole 306 comprises a bottom 314, connecting sleeves 315, a connecting section 316 and a lower edge 317.
  • Fig. 23 schematically shows in a horizontal cross sectional view, located at the exchangeable sections, six lateral sections which form together a lateral mould section.
  • the exchangeable sections shown in Fig. 23 are chosen in such a way, that a manhole bottom of the A-type (see Fig. 21) can be manufactured by means of the corresponding mould.
  • four exchangeable sections are realized with core 307 and two without respectively.
  • Fig. 23 shows further that the different lateral sections 303 can not be removed radially, after having moulded the manhole bottom, since the central axes of the connecting sleeves do not all intersect the central axis of the manhole bottom.
  • the direction for removal of the lateral sections 303 is determined by the central axis of the connecting sleeves.
  • the central axes of the connecting sleeves together must enclose a previously defined angle, whereby the central axes need not necessarily be provided in the same plane.
  • the previously defined angle is generally not identical to the angles which are enclosed by the central axes of the lateral sections.
  • core 307 fits entirely within the circumference of exchangeable section 305. If the central axis of a lateral section 303 and the central axis of core 307 of the exchangeable section 305 located in the lateral section 303 are not parallel, core 307 can only be placed in exchangeable section 305 in such way, that the central axis of core 307 intersects the central axis of the manhole bottom, provided that the diameter of core 307 is sufficiently small.
  • a lateral mould section of the mould system according to the invention is schematically shown with a exchangeable section 305 for a connecting sleeve in each lateral section.
  • each lateral section has a length of arc which is identical to 1/6 part of the total inner circumference of the manhole bottom.
  • the central axes of three connecting sleeves are crossing the central axis of the manhole bottom.
  • the central axes of the other connecting sleeves are distantly positioned from the central axis of the manhole bottom. This follows from the choice of the mutual angles between the central axes, together with the fact that an exchangeable section is located mainly in the centre of a base section.
  • the angles formed by the central axes of the connecting sleeves are also indicated in Fig. 24.
  • the choice of angles shown in Fig. 24 makes it possible to manufacture manhole bottoms of which the connecting sleeves form an angle which varies from 45° to 180° in steps of 15°. Figs.
  • FIG. 22 and 24 show a front view and a top view respectively of lateral section 303, in which an exchangeable section 305 is assembled which determines the inner mould of a connecting sleeve of a maximum diameter.
  • the base section 304 is provided with notches 308, which determine the mould hole of reinforcing ridges of the manhole bottom to be made.
  • Base section 304 comprises further a section 309, which determines the mould hole of connecting section 316 (see Fig. 20) of the manhole bottom to be manufactured in order to connect a bottom shaft to the manhole bottom.
  • the exchangeable section 305 is positioned in notch 312 by means of a freely removable connection, e.g. a bolted joint.
  • a core 307 which determines the inner mould of a connecting sleeve which possesses a diameter which is smaller than the maximum diameter.
  • Core 307 is positioned eccentrically with respect to the circumference of exchangeable section 305 in a vertical direction upwards.
  • Core 307 can also be positioned concentrically or eccentrically in horizontal direction on exchangeable section 305.
  • Notches 308' are connected with corresponding notches 308 of base section 304. It is obvious that the exchangeable sections and the base sections may be provided with provisions for cooling-down.
  • the height of bottom section 302 (see Fig. 20) can be adapted to the diameter of the connecting sleeves.
  • Fig. 28 shows in a very schematic way another embodiment of the mould according to the mould system of the invention.
  • the lateral section comprises seven lateral section parts 303.
  • the central axes of cores 307 for the connecting sleeves to be manufactured intersect the central axis of the mould.
  • the central axes of cores 307 mutually define angles of 45° and 67,5°. This choice of angles between the central axes of the cores for the connecting sleeves and the position of the lateral section parts as shown in Fig.
  • the mould system which consists of a multipartite outer mould is, for simplicity's sake schematically, shown in Fig. 5 by 32, 32'.
  • Figs. 18-20, 23-25 and 27-28 show the different outer mould sections which are attached to mould support blocks 11, 11' in Fig. 2 by means of fixing means known per se.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Manufacturing Of Electrical Connectors (AREA)

Claims (23)

  1. Dispositif de serrage prévu pour générer d'importantes forces de serrage de plus de 500 tonnes, et plus particulièrement destiné à être utilisé dans une machine de moulage par injection pour la fabrication de produits volumineux et nécessitant donc des forces de serrage importantes, ledit dispositif de serrage consistant principalement en une combinaison de :
    a. au moins deux plaques d'appui (8, 9), par exemple une plaque fixe et une plaque mobile sur lesquelles des sections de moulage internes peuvent être disposées, les dites plaques d'appui (8,9) étant dotées d'au moins deux ouvertures de guidage (7) destinées au transport d'un moyen de guidage allongé (2) et équipées d'un certain nombre d'ouvertures d'insertion (10) destinées à recevoir des moyens auxiliaires (12) prévus sur au moins deux sections de moulage à blochets d'appui (11) et utilisés pour transmettre des forces de serrage extrêmes aux dites sections de moulage à blochets d'appui (11), les dites forces de serrage étant produites principalement par l'application d'un contact direct uniquement entre les plaques d'appui (8,9) et les sections de moulage à blochets d'appui (11) ;
    b. au moins deux moyens de guidage allongés (2), chaque moyen disposant, entre ses extrémités, d'au moins deux moyens d'écartement (3) servant à limiter la distance de fermeture réciproque entre les plaques d'appui (8,9) à sections de moulages avec blochets d'appui (11) insérées, pour le cas où les forces de serrage agiraient longitudinalement par rapport aux moyens de guidage (2) ;
    c. au moins deux sections de moulage avec blochets d'appui(11), chaque section disposant des moyens auxiliaires (12) et les sections de moulage externe du moule-produit à inclure pouvant être attachées sur les dits moyens avec des moyens de fixation ;
    d. une première série de moyens de contrôle et de pression (34) destinés aux mouvements vers l'intérieur ou l'extérieur de chaque section de moulage avec blochets d'appui (11) en vue de la fermeture ou de l'ouverture des sections de moulage attachées aux sections de moulage avec blochets d'appui (11) pour le produit fini ;
    e. une deuxième série de moyens de contrôle et de pression (22) destinée à verrouiller les moyens auxiliaires (12) par rapport aux sections de moulage avec blochets d'appui (11) dans les ouvertures d'insertion (10) prévues dans les plaques d'appui (8,9) ;
    f. un certain nombre de moyens de serrage distincts (37) destinés à verrouiller la position d'un moyen de guidage (2) par rapport à une plaque d'appui (8,9) ainsi que la position de cette dernière par rapport aux moyens d'écartement susmentionnés (3) ;
    g. un bâti de machine auquel ou dans lequel les composantes de machine mentionnées sous a) jusque f) compris sont intégrées pour former une machine de moulage par injection complète.
  2. Dispositif de serrage selon la revendication 1, caractérisé en ce que une section de moulage avec blochets d'appui (11) consiste, étant donné les forces de serrage élevées qui agissent, en une section centrale carrée aplatie et quelque peu allongée° possédant une taille et une masse essentielle et se prolongeant vers ses extrémités en un moyen auxiliaire carré (12).
  3. Dispositif de serrage selon la revendication 2, caractérisé en ce que le moyen auxiliaire carré (12) présente, sur son côté, un enfoncement concave (15) opposé au moule.
  4. Dispositif de serrage selon la revendication 3, caractérisé en ce que l'enfoncement concave (15) est de forme circulaire et sert de surface de support pour une surface de clavetage (16) pouvant être ajustée dans la position oblique désirée par rapport à l'enfoncement (15), par solidarité avec une surface de contre-clavetage (17) placée dans l'ouverture d'insertion (10) à l'aide de moyens de fixation et d'ajustement (41, 43).
  5. Dispositif de serrage selon la revendication 4, caractérisé en ce que l'ouverture d'insertion (10) pour les moyens auxiliaires (12) située dans la plaque d'appui (8,9) est dotée d'une surface de contre-clavetage (17) correspondante laquelle percute la surface de clavetage (16) susmentionnée pendant un mouvement de serrage de la plaque d'appui (9), produisant par la même occasion la force de serrage.
  6. Dispositif de serrage selon la revendication 1, caractérisé en ce que le moyen de guidage (2) a, sur toute sa longueur, une section transversale circulaire de diamètre généralement égal, sauf au niveau du moyen d'écartement (3) systématiquement constitué d'une section à embase annulaire prévue à la distance requise à partir de l'extrémité du moyen de guidage (2) ainsi qu'à proximité et à une distance correspondant à l'épaisseur de la plaque d'appui (8,9), vers l'extrémité du moyen de guidage (2), ce dernier présentant un enfoncement jusqu'à un diamètre inférieur (35, 36) et sur une longueur totale correspondant à la hauteur du moyen de serrage susmentionné (37).
  7. Dispositif de serrage selon la revendication 1, caractérisé en ce que le moyen de guidage (2) présente une section transversale circulaire de diamètre égal sur toute la longueur sauf près de l'extrémité dudit moyen, où la dite section présente un enfoncement jusqu'à un diamètre inférieur (35, 36) correspondant à la hauteur du moyen de serrage susmentionné (37).
  8. Dispositif de serrage selon les revendications 6 et 7, caractérisé en ce que le moyen de serrage ayant une fonction de verrouillage par rapport à l'enfoncement du moyen de guidage (2) est divisé en plusieurs parties.
  9. Méthode de fabrication d'un produit moulé par injection en utilisant un dispositif de serrage conforme à l'une ou l'autre des revendications 1 à 8 précédentes, et caractérisée par au moins les étapes suivantes :
    au moins deux moyens de guidage allongés (2) sont disposés dans les ouvertures d'insertion d'au moins deux plaques d'appui (8,9) ;
    si nécessaire, les sections de moulage interne requises sont attachées aux plaques d'appui (8,9) ;
    un certain nombre de sections de moulage avec blochets d'appui (11) sont placées entre les plaques d'appui (8,9), des sections de moulage distinctes constituant, ensemble, le moule externe complet (32,32') étant attachées sur chaque plaque ;
    les moyens auxiliaires (12) attachés aux blochets d'appui (11) sont chaque fois verrouillés par le mouvement vers l'intérieur des plaques d'appui (8,9) via le moyen de guidage (2) prévu dans les dites plaques (8,9), les dits moyens auxiliaires générant ainsi simultanément des forces de serrage de plus en plus importantes par rapport à la composition finale du moule externe fermé complet (32,32'), constitué de sections de moulage distinctes et complémentaires ;
    la position mutuelle des plaques d'appui (8,9) par rapport aux moyens de guidage (2) est verrouillée vers l'intérieur, en direction du moule externe, après augmentation des forces de serrage (III-III) à l'aide de plusieurs moyens de serrage (37), générant ainsi la force de serrage requise pour les sections de moulage distinctes (32, 32'), dans une direction (I-I) parallèle au moyen de guidage (2) ;
    une fois le moule externe fermé de toutes parts par l'application de forces de verrouillage, les forces de verrouillage supplémentaires sont, avant, pendant et après le moulage par injection, produites exclusivement par l'application et la suppression de serrures mécaniques (8,9 et 37), sans qu'aucune pression hydraulique et/ou pneumatique extrêmement élevée sur le moule ne soit nécessaire.
    La méthode de moulage par injection est amorcée notamment en chauffant le moule puis en le remplissant tout en appliquant une pression élevée, après quoi on procède au déverrouillage des sections de moulage en sens inverse puis au retrait du produit moulé par injection.
  10. Machine de moulage par injection, et plus particulièrement machine de moulage par injection disposée verticalement dans laquelle est intégré un dispositif de serrage (11) selon les revendications 1 à 8, et caractérisée en ce que le bâti de machine (31) se compose d'une table centrée à base horizontale, plus spécifiquement en forme de polygone, sur laquelle, aux deux extrémités d'une ligne diamétralement centrée située dans le plan de la dite table, quatre réceptions ont été prévues pour chaque extrémité, et plus particulièrement pour chaque extrémité du moyen de guidage (2) à positionner verticalement, la table étant également dotée d'au moins deux, et plus particulièrement six, moyens de guidage de table coulissant vers l'extérieur
  11. Machine de moulage par injection selon la revendication 10, caractérisée en ce que chaque blochet d'appui (11) est attaché à un support en forme de L (24) qui, dans sa partie inférieure, laisse place à une base horizontale allongée déplaçable le long d'un moyen de guidage de table (25-30) afin d'ouvrir et de fermer le moule externe divisé (32, 32').
  12. Machine de moulage par injection selon la revendication 11, caractérisée en ce que le blochet d'appui (11) est fixé à la partie supérieure du support (24) à l'aide d'un axe central (fig. 3-5) situé contre la face arrière du blochet d'appui, ledit blochet (11) étant verrouillé par rapport à la partie supérieure du support grâce à quatre épingles ou boulons (Fig. 3) projetés latéralement et perpendiculairement sur les points angulaires du blochet d'appui (11), les dit(e)s épingles ou boulons étant insérés dans des orifices prévus à des positions correspondantes sur le support (24).
  13. Machine de moulage par injection selon la revendication 12, caractérisée en ce que le côté (13) du blochet d'appui (11) faisant face au moule externe (32, 32') est formé par une table de serrage (14) plane, élargie sur les côtés jusqu'au delà du blochet d'appui (11) et destinée au serrage de la partie externe du moule, la dite table (13, 14) disposant aussi d'un certain nombre de moyens de serrage.
  14. Machine de moulage par injection selon les revendications 10-13, caractérisée en ce que, vu de côté, l'assemblage support-socle (24) est en forme de L et les intersections de trois axes centraux des voies de guidage (26, 29,30) rencontrent l'axe central commun de deux axes centraux des voies de guidage (25, 28) prolongés mutuellement, en un point distant de l'intersection de lignes diagonales tirées entre les axes centraux verticaux du moyen de guidage (2) situés sur les bords d'un rectangle, la dite intersection formant presque une intersection avec l'axe central du moyen de guidage de table restant (27).
  15. Machine de moulage par injection selon les revendications 10-14, caractérisée en ce que un double bord de bâti de machine a été disposé à califourchon par rapport aux deux voies de guidage (25, 28) placées dans une position prolongée mutuellement et en ce que la distance mutuelle entre les jambes à angles opposés du dit col de bâti est telle que pendant l'ouverture et/ou le verrouillage du moule externe (32, 32'), les supports ainsi que les blochets d'appui attachés aux dits supports peuvent être déplacés entre les jambes du bord de bâti de la machine ou entre la position fixée du moyen de guidage (2).
  16. Machine de moulage par injection selon la revendication 15, caractérisée en ce que, dans un plan horizontal de la table de soutien de la machine de moulage par injection, les intersections de l'axe central vertical du moyen de guidage et les intersections des colonnes verticales du bord de bâti de la machine sont toutes positionnées sur les côtés ou sur les bords d'un rectangle imaginaire.
  17. Machine de moulage par injection selon la revendication 16, caractérisée en ce que la hauteur du double bord de bâti en forme de D de la machine par rapport à la table de soutien correspond à au moins le double de la hauteur d'une plaque d'appui (8,9) augmenté de la hauteur de l'extrémité supérieure d'un blochet d'appui (11) qui se projeté au-dessus de la table de soutien.
  18. Plaque d'appui destinée à être utilisée dans un dispositif de serrage et/ou une machine de moulage par injection selon une des revendications 1 à 8 et 10 à 17 précédentes, et caractérisée en ce que chaque plaque d'appui en forme de disque (8,9) d'une épaisseur matérielle essentielle et constituée en un matériau solide dispose de quatre ouvertures de guidage (7) pour chacun des quatre moyens de guidage (2), les points centraux des dites ouvertures de guidage (7) étant disposés sur les bords d'un rectangle, et dispose aussi de six ouvertures d'insertion (10) disposées diamétralement en face les unes des autres par rapport au centre de la plaque d'appui (8,9) et le long de la circonférence interne de la plaque d'appui (8,9), et présentant plus particulièrement une configuration rectangulaire, chaque ouverture d'insertion étant dotée, sur un côté tourné vers le centre de la plaque d'appui (8,9), au moins à mi-distance de la dite plaque, d'une surface de clavetage (17) solidaire de la surface de clavetage correspondante (16) sur un moyen auxiliaire solidaire (12) attaché au blochet d'appui (11).
  19. Plaque d'appui selon la revendication 18, caractérisée en ce que l'angle de clavetage est inférieur ou égal à 8°.
  20. Moyen de guidage allongé (2) destiné à être utilisé dans un dispositif de serrage (1) et/ou une machine de moulage par injection selon chacune des revendications 1 à 8 et 10 à 17 précédentes, et caractérisé en ce que un enfoncement a été prévu près de chaque extrémité du moyen de guidage (2) de telle sorte qu'un moyen de serrage (37) divisé peut être placé dans ledit enfoncement pour fermer une plaque d'appui (8,9) à l'extérieur, la face interne de la dite plaque supportant une embase fixe (3) attachée aux moyens de guidage.
  21. Machine de moulage par injection, et plus particulièrement machine de moulage par injection disposée horizontalement, comprenant un dispositif de serrage (1) et/ou une machine de moulage par injection avec plaque d'appui (8,9) et moyens de guidage (2) selon les revendications 1 à 8 et 10 à 17, et caractérisée en ce que le bâti de la dite machine est constitué d'une table de soutien horizontale allongée équipée de moyens de guidage (25) et d'une console centrale (11) des deux côtés de laquelle a été prévu un support (24), capable de se déplacer et de coulisser le long de moyens de guidage de table (25), dotée d'une plaque d'appui (8,9) attachée et de moyens d'ajustement destinés à guider les extrémités des moyens de guidage (2) dans les plaques d'appui (8,9) via les ouvertures de guidage (7) et à verrouiller systématiquement les plaques d'appui à moule externe constitué au moins de deux composantes insérées en utilisant au moins un moyen de serrage (37).
  22. Machine de moulage par injection selon la revendication 21, caractérisée en ce que le bord de bâti de la machine (31) est doté de moyens de levage et de transport adaptés servant notamment à positionner un moule interne dans le moule externe (32, 32') et à fixer la position des dits moules par rapport à la console centrale (11).
  23. Blochet d'appui destiné à être utilisé dans un dispositif de serrage selon une des revendications précédentes, et caractérisé en ce que le blochet d'appui (11) consiste, vu de côté, en un noyau central massif cédant sa place à un moyen auxiliaire (12) en forme de blochet sur les deux côtés, dans la direction du petit côté du rectangle, dans lequel un enfoncement (15) cylindrique a été prévu, dans une voie perpendiculaire au plan de blochet, et dans lequel une surface de serrage de composantes de moulage a été aménagée sur la surface d'attaque du blochet d'appui (11), la dite surface d'attaque étant plus large que l'épaisseur du blochet d'appui et la face arrière du blochet d'appui disposant de moyens (épingles, axes, yeux porteurs) pour le support et le déplacement du blochet d'appui (11) vers un support (24, voir Fig. 3).
EP97909752A 1996-10-22 1997-10-22 Systeme de fermeture de moule, procede et systeme de moule pour produire des articles de grande dimension moules par injection avec application de pressions de fermeture tres elevees, ainsi que machine de moulage par injection ainsi equipee Expired - Lifetime EP0934149B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
NL1004331A NL1004331C2 (nl) 1996-10-22 1996-10-22 Matrijssysteem voor het vormen van putbodems met aansluitmoffen, draaginrichting voor een matrijs van een dergelijk matrijssysteem en werkwijze voor het vervaardigen van een putbodem.
NL1004331 1996-10-22
NL1004509A NL1004509C1 (nl) 1996-11-12 1996-11-12 Vormsluitinrichting onder toepassing van zéér hoge sluitkrachten, b.v. vanaf 500 ton alsmede spuitgietmachine welke daarmede is uitgerust.
NL1004509 1996-11-12
PCT/NL1997/000586 WO1998017458A1 (fr) 1996-10-22 1997-10-22 Systeme de fermeture de moule, procede et systeme de moule pour produire des articles de grande dimension moules par injection avec application de pressions de fermeture tres elevees, ainsi que machine de moulage par injection ainsi equipee

Publications (2)

Publication Number Publication Date
EP0934149A1 EP0934149A1 (fr) 1999-08-11
EP0934149B1 true EP0934149B1 (fr) 2003-05-07

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EP (1) EP0934149B1 (fr)
AT (1) ATE239603T1 (fr)
DE (1) DE69721798T2 (fr)
DK (1) DK0934149T3 (fr)
PL (1) PL186426B1 (fr)
WO (1) WO1998017458A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2465434B (en) * 2008-11-25 2013-09-04 Polypipe Ltd Inspection chambers

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1147301A (fr) * 1956-04-07 1957-11-21 Presse de moulage perfectionnée
FR1254950A (fr) * 1960-01-16 1961-03-03 Porte-moule à ouverture et fermeture automatique dans les machines à injection
FR1406612A (fr) * 1964-06-10 1965-07-23 Machine pour le moulage par injection de pièces diverses
DE2134627C3 (de) * 1971-07-10 1975-05-22 Friedrich-Wilhelms-Eisenhuette Gravenhorst Giesserei Und Maschinenfabrik Niemeyer Kg, 4446 Gravenhorst Kanalisationsschacht und Vorrichtung zu seiner Herstellung
FR2191982B1 (fr) * 1972-07-07 1975-03-07 Kourbatoff Alexandre
GB2046811B (en) * 1979-03-12 1983-01-26 Plastiers Ltd Drainage inspection chambers
JPH0866950A (ja) * 1994-08-30 1996-03-12 Sony Corp 射出成形装置及び射出成形方法
NL1001813C1 (nl) * 1995-12-04 1996-02-15 Basic Market Werkwijze voor het vormen van een voorwerp door middel van spuitgieten alsmede matrijs voor toepassing van de werkwijze.

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Publication number Publication date
EP0934149A1 (fr) 1999-08-11
PL186426B1 (pl) 2004-01-30
DK0934149T3 (da) 2003-08-18
WO1998017458A1 (fr) 1998-04-30
ATE239603T1 (de) 2003-05-15
DE69721798D1 (de) 2003-06-12
DE69721798T2 (de) 2004-06-17
PL332962A1 (en) 1999-10-25

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